Proflow Fuel Pressure Regulator, Carburettor Bypass, 4-13 PSI, 4-Port, 900 HP, B Steering and Suspension they can handle engines with

they can handle engines with moderate compression ratios

Valve Cover Breather Cap Push In 1"(25mm)

with reduce flow

RWF-823-04-04bk

Part Number : PFE659

Proflow Fuel Pressure Regulator, Carburettor Bypass, 4-13 PSI, 4-Port, 900 HP, B Steering and Suspension they can handle engines withPart Number : Proflow's carburetted bypass regulators are designed to be used with the stock, in tank pump or aftermarket EFI fuel pump in a carburetted application. This means high volume electric or mechanical fuel pumps of any make can also be used, while providing laminar flow to your carburettor and accurate adjustable pressure control. With their boost reference port,high flow capacity and stainless steel internals for long lasting performance,